Preprints
https://doi.org/10.5194/essd-2021-404
https://doi.org/10.5194/essd-2021-404

  18 Nov 2021

18 Nov 2021

Review status: this preprint is currently under review for the journal ESSD.

LGHAP: a Long-term Gap-free High-resolution Air Pollutants concentration dataset derived via tensor flow based multimodal data fusion

Kaixu Bai1,2, Ke Li1, Mingliang Ma3, Kaitao Li4, Zhengqiang Li4, Jianping Guo5, Ni-Bin Chang6, Zhuo Tan1, and Di Han1 Kaixu Bai et al.
  • 1Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
  • 2Institute of Eco-Chongming, 20 Cuiniao Rd., Chongming, Shanghai 202162, China
  • 3School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250101, China
  • 4State Environmental Protection Key Laboratory of Satellite Remote Sensing, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
  • 5State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
  • 6Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, USA

Abstract. Developing a big data analytics framework for generating a Long-term Gap-free High-resolution Air Pollutants concentration dataset (abbreviated as LGHAP) is of great significance for environmental management and earth system science analysis. By synergistically integrating multimodal aerosol data acquired from diverse sources via a tensor flow based data fusion method, a gap-free aerosol optical depth (AOD) dataset with daily 1-km resolution covering the period of 2000–2020 in China was generated. Specifically, data gaps in daily AOD imageries from MODIS aboard Terra were reconstructed based on a set of AOD data tensors acquired from satellites, numerical analysis, and in situ air quality data via integrative efforts of spatial pattern recognition for high dimensional gridded image analysis and knowledge transfer in statistical data mining. To our knowledge, this is the first long-term gap-free high resolution AOD dataset in China, from which spatially contiguous PM2.5 and PM10 concentrations were estimated using an ensemble learning approach. Ground validation results indicate that the LGHAP AOD data are in a good agreement with in situ AOD observations from AERONET, with R of 0.91 and RMSE equaling to 0.21. Meanwhile, PM2.5 and PM10 estimations also agreed well with ground measurements, with R of 0.95 and 0.94 and RMSE of 12.03 and 19.56 μg m−3, respectively. Overall, the LGHAP provides a suite of long-term gap free gridded maps with high-resolution to better examine aerosol changes in China over the past two decades, from which three distinct variation periods of haze pollution were revealed in China. Additionally, the proportion of population exposed to unhealthy PM2.5 was increased from 50.60 % in 2000 to 63.81 % in 2014 across China, which was then drastically reduced to 34.03 % in 2020. Overall, the generated LGHAP aerosol dataset has a great potential to trigger multidisciplinary applications in earth observations, climate change, public health, ecosystem assessment, and environmental management. The daily resolution AOD, PM2.5, and PM10 datasets can be publicly accessed at https://doi.org/10.5281/zenodo.5652257 (Bai et al., 2021a), https://doi.org/10.5281/zenodo.5652265 (Bai et al., 2021b), and https://doi.org/10.5281/zenodo.5652263 (Bai et al., 2021c), respectively. Meanwhile, monthly and annual mean datasets can be found at https://doi.org/10.5281/zenodo.5655797 (Bai et al., 2021d) and https://doi.org/10.5281/zenodo.5655807 (Bai et al., 2021e), respectively. Python, Matlab, R, and IDL codes were also provided to help users read and visualize these data.

Kaixu Bai et al.

Status: open (until 13 Jan 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Kaixu Bai et al.

Data sets

Daily 1-km gap-free PM2.5 grids in China, v1 (2000–2020) Bai, K., Li, K. Tan, Z., Han, D., and Guo, J. https://doi.org/10.5281/zenodo.5652265

Daily 1-km gap-free PM10 grids in China, v1 (2000–2020) Bai, K., Li, K. Tan, Z., Han, D., and Guo, J. https://doi.org/10.5281/zenodo.5652263

Monthly averaged 1-km gap-free AOD, PM2.5 and PM10 grids in China, v1 (2000–2020) Bai, K., Li, K. Tan, Z., Han, D., and Guo, J. https://doi.org/10.5281/zenodo.5655797

Annual mean 1-km gap-free AOD, PM2.5 and PM10 grids in China, v1 (2000–2020) Bai, K., Li, K. Tan, Z., Han, D., and Guo, J.: https://doi.org/10.5281/zenodo.5655807

Daily 1-km gap-free AOD grids in China, v1 (2000–2020) Bai, K., Li, K. Tan, Z., Han, D., and Guo, J. https://doi.org/10.5281/zenodo.5652265

Kaixu Bai et al.

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Short summary
A Long-term Gap-free High-resolution Air Pollutants concentration dataset, providing spatially contiguous aerosol optical depth (AOD), PM2.5 and PM10 concentration with daily 1-km resolution from 2000 to 2020 in China, was generated. This is the first long-term gap-free high resolution aerosol dataset in China, which has a great potential to trigger multidisciplinary applications in earth observations, climate change, public health, ecosystem assessment, and environmental management.